Suppression of flow-induced resonant cavity noise using mass flow injection
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摘要: 通过数值仿真揭示了开口前缘垂直注入质量流和前壁面平行注入质量流抑制流激孔腔噪声的机制,研究了多参数影响下脉动压力峰值降噪量和总降噪量随质量流注入速度的变化规律。开口前缘垂直注入质量流通过抬升剪切层,避免漩涡冲击开口后缘,抑制流激孔腔噪声脉动压力峰值;在一定范围内质量流注入速度越大,脉动压力峰值降噪量越大,但是低频部分引起的抬升也会越高,导致总降噪量先增大后减小;经优化后的峰值降噪量和总降噪量分别可以达到15dB和9.5dB。开口前壁面平行注入质量流则是通过加强开口处剪切层的稳定性,避免发生漩涡脱落,达到抑制流激孔腔噪声的目的;当质量流入口面积大于孔腔开口前壁面积2/3时,不仅可以显著降低流激孔腔噪声脉动压力的峰值,并且可以很好地抑制其它频段噪声的抬升;质量流注入速度为来流速度的0.5倍时,脉动压力峰值降噪量和总降噪量分别可以达到18dB和15.4dB。Abstract: The mechanism of flow-induced cavity noise control by vertical mass flow injection at the leading edge of the opening and parallel mass flow injection at the front wall surface is revealed through numerical simulation, and the law of peak noise reduction and total noise reduction by the injected flow velocities under the influence of multiple parameters is studied. The vertical mass flow injection at the leading edge of the opening lifts shear layer to avoid the impact of vortex on the trailing edge of the opening and suppress the noise pulsation pressure peak of the flow-induced cavity. In a certain range, the higher the injected flow velocity, the greater the peak reduction of the flow-induced cavity noise, but the lift in the low-frequency caused by the mass flow injection will also be higher, resulting in the total sound pressure level first decreases and then increases. After optimization, the peak noise reduction and total noise reduction can reach 15dB and 9.5dB, respectively. The parallel injection of mass flow into the front wall of the opening can avoid vortex shedding by strengthening the stability of the shear layer at the opening and achieve the purpose of suppressing the flow-induced cavity noise. When the entrance area is larger than two-third of the front wall area, not only the peak value of flow-induced cavity noise can be significantly reduced, but also the rise of noise in other frequency band can be well restrained, and the noise reduction effect of total sound pressure level is obvious. When the mass flow injection velocity is 0.5 times of the incoming flow velocity, the peak and total noise reduction of the pulsating pressure can reach 18dB and 15.4dB, respectively.
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Keywords:
- Cavity noise /
- Active noise control /
- Resonant peak /
- Noise reduction
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